Piston hat



FIG. 1 is a front perspective view of a piston hat embodying my newdesign;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front perspective view thereof showing the piston element ofthe hat in an alternate position tilted to the left side of the hat;

FIG. 4 is a front perspective view thereof showing the piston element inanother alternate position tilted to the right side of the hat;

FIG. 5 is a right side perspective view of FIG. 1;

FIG. 6 is a left side perspective view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

I claim the ornamental design for a piston hat, as shown and described.